公开(公告)号：US11670337B1

公开(公告)日：2023-06-06

申请号：US17540566

申请日：2021-12-02

Applicant: Seagate Technology LLC

Inventor： Steven Douglas Granz ,  Ian James Gilbert

IPC: G11B20/12 ,  G11B21/08

CPC classification number: G11B21/08

Abstract: A data storage medium includes a substrate, and a plurality of spaced-apart discrete data storage tracks supported by the substrate. The data storage medium also includes magnetic flux sinking material between the discrete data storage tracks and over the substrate. As an alternative to the magnetic flux sinking material, plasmonic material may be included between the discrete data storage tracks and over the substrate.

公开(公告)号：US20210407546A1

公开(公告)日：2021-12-30

申请号：US17323474

申请日：2021-05-18

Applicant: Seagate Technology LLC

Inventor： Ian James Gilbert ,  Peng Peng ,  Tim Rausch ,  Jan-Ulrich Thiele

IPC: G11B20/10 ,  G11B20/18 ,  G11B5/73

Abstract: A disk drive apparatus determines a pattern of bits of a data signal applied to a magnetic write transducer of a heat-assisted magnetic recording apparatus. The magnetic write transducer applies a magnetic field to a recording medium in response to the data signal. A laser power signal is applied to a laser that heats the recording medium while the magnetic field is applied. The laser power signal is modulated based on the pattern of bits. The modulation reduces differences between track widths of recorded marks having different elapsed time values and/or increases a signal-to-noise ratio of the recorded marks having different elapsed time values.

公开(公告)号：US11037597B1

公开(公告)日：2021-06-15

申请号：US16915391

申请日：2020-06-29

Applicant: Seagate Technology LLC

Inventor： Ian James Gilbert ,  Peng Peng ,  Tim Rausch ,  Jan-Ulrich Thiele

IPC: G11B11/105 ,  G11B20/10 ,  G11B20/18 ,  G11B5/73 ,  G11B5/00 ,  G11B7/1267 ,  G11B7/126 ,  G11B7/1263

Abstract: Two or more different elapsed time values are determined between transitions of a data signal applied to a magnetic write transducer of a heat-assisted magnetic recording apparatus. Two or more different power values of the laser are respectively associated with the two or more different elapsed time values. The two or more different power levels are selected to reduce differences between track widths of recorded marks having the two or more different elapsed time values.

公开(公告)号：US20230178110A1

公开(公告)日：2023-06-08

申请号：US17540566

申请日：2021-12-02

Applicant: Seagate Technology LLC

Inventor： Steven Douglas Granz ,  Ian James Gilbert

IPC: G11B21/08

CPC classification number: G11B21/08

Abstract: A data storage medium includes a substrate, and a plurality of spaced-apart discrete data storage tracks supported by the substrate. The data storage medium also includes magnetic flux sinking material between the discrete data storage tracks and over the substrate. As an alternative to the magnetic flux sinking material, plasmonic material may be included between the discrete data storage tracks and over the substrate.

公开(公告)号：US11270733B2

公开(公告)日：2022-03-08

申请号：US17323474

申请日：2021-05-18

Applicant: Seagate Technology LLC

Inventor： Ian James Gilbert ,  Peng Peng ,  Tim Rausch ,  Jan-Ulrich Thiele

IPC: G11B11/105 ,  G11B20/10 ,  G11B5/73 ,  G11B20/18 ,  G11B5/00 ,  G11B7/126 ,  G11B7/1263 ,  G11B7/1267

Abstract: A disk drive apparatus determines a pattern of bits of a data signal applied to a magnetic write transducer of a heat-assisted magnetic recording apparatus. The magnetic write transducer applies a magnetic field to a recording medium in response to the data signal. A laser power signal is applied to a laser that heats the recording medium while the magnetic field is applied. The laser power signal is modulated based on the pattern of bits. The modulation reduces differences between track widths of recorded marks having different elapsed time values and/or increases a signal-to-noise ratio of the recorded marks having different elapsed time values.

公开(公告)号：US11495249B1

公开(公告)日：2022-11-08

申请号：US17227958

申请日：2021-04-12

Applicant: Seagate Technology LLC

Inventor： Ian James Gilbert ,  Peng Peng ,  Todd Michael Lammers ,  Tim Rausch

IPC: G11B5/68 ,  G11B5/00 ,  G11B5/012

Abstract: Two or more different recording currents are applied to a write coil of a recording head. A first of the two or more currents is a positive current and a second of the two or more currents is a negative current. In response to the application of the two or more different recording currents, a data stream is recorded to regions of a moving continuous magnetic recording medium such that each region has three or more magnetic states. The three or more magnetic states can be read from the continuous magnetic recording medium via a magnetic read transducer to recover the data stream.

公开(公告)号：US10339963B1

公开(公告)日：2019-07-02

申请号：US16025424

申请日：2018-07-02

Applicant: Seagate Technology LLC

Inventor： Drew Michael Mader ,  Ian James Gilbert ,  Walter R. Eppler ,  Tim Rausch

IPC: G11B11/00 ,  G11B5/09 ,  G11B5/00 ,  G11B5/60 ,  G11B7/1263 ,  G11B7/1267 ,  G11B7/126

Abstract: Pseudorandom bit sequences are recorded to a heat-assisted recording medium at a laser power that is stepped while recording the pseudorandom bit sequences. The pseudorandom bit sequences are read from the heat-assisted recording medium to determine timing differences between bits written before and after the laser power is stepped. A thermal gradient of bits written to the heat-assisted recording medium is determined based on the timing differences.